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That prevents the linker from dead-stripping the function, as it is not called
directly, it is resolved in the runtime via dlsym().

I copied the change from https://crrev.com/c/833995

R=mmoroz@chromium.org

Bug: 837098
Change-Id: I998517ebab623e67d275fe656643a8ee5fd1e951
Reviewed-on: https://chromium-review.googlesource.com/1148391Reviewed-by: Max Moroz <mmoroz@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577532}